Grass clippings will enhance your lawn. If you live at a condo/home association, you can find a land maintenance business that can mulch mow. But, make sure they know the correct mowing heights, etc. See this link for information: http://perfectearthproject.org/
"Grass clippings returned to the lawn provide up to 25 percent of your lawn's total fertilizer needs. Clippings contain about 4 percent nitrogen, 2 percent potassium and 1 percent phosphorus. While decomposing, they also serve indirectly as a food source for the bacteria in the soil, which are doing many beneficial things (such as decomposing thatch) for a healthy turf environment." --University of Missouri Extension.
If you have a smaller lawn, this one fits the bill-- it is environmentally friendly and economical!